I've been participating in the OpenStreetMap project for a while, mostly adding roads that I found in my wanders, but for the last couple of months, I've been putting an intensive effort into making one region of the map as good as I can get it: The Mojave National Preserve:

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All of my changes to the map have been uploaded to the OpenStreetMap master database, which include:

Added Designated Wilderness areas from USGS database

Correcting classification of dirt and 4x4-only roads as "tracks"

Adding, correcting and adding detail to the railroads and power lines

Adding mines, volcanoes, dry lakes, springs, sand dunes and many other land features

Adding and correcting hundreds of tracks throughout the park

Further, I've modified the map rendering on my own OpenStreetMap database/tileset instance (above), to make the map more useful for those of us who use it to wander around in the desert:

Added special rendering rules for Designated Wilderness areas

Added elevation contours (in meters)

Added rendering of sand areas as speckled brown

Raised the rendering of all minor features to zoom level 12

Always render railroads as black-white tracks, so as to not confuse with roads

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